Add SSTB self-employment income variable and split QBID by category#7944

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PavelMakarchuk wants to merge 11 commits intomainfrom

add-sstb-self-employment-income

Commits on Apr 7, 2026

Add sstb_self_employment_income variable and per-category QBID computation

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Commits on Apr 8, 2026

Commits on Apr 11, 2026